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参数资料
| 型号： | MAX1742-MAX1842 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | 数字信号处理 |
| 英文描述： | Replaced by TMS320C6410 : Digital Signal Processor 40-PDIP 0 to 0 |
| 中文描述： | 1A/2.7A的1MHz，降压型同步整流和内部开关稳压器 |
| 文件页数： | 8/16页 |
| 文件大小： | 597K |
| 代理商： | MAX1742-MAX1842 |
M
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
8
_______________________________________________________________________________________
NAME
FUNCTION
1
SHDN
Shutdown Control Input. Drive
SHDN
low to disable the reference, control circuitry, and internal
MOSFETs. Drive high or connect to V
CC
for normal operation.
Supply Voltage Input
—
for the internal PMOS power switch.
PIN
Pin Description
MAX1842
LOAD-TRANSIENT RESPONSE
V
OUTPUT
50mV/div
I
L
2A/div
10
μ
s/div
0
MAX1842
LINE-TRANSIENT RESPONSE
V
2V/div
V
OUTPUT
20mV/div
AC-COUPLED
MAX1842 toc18
20
μ
s/div
I
OUT
= 2.5A, V
OUT
= 1.5V, R
TOFF
= 100k
, L = 2.2
μ
H
2, 4
IN
3, 14, 16
LX
Connection for the drains of the PMOS power switch and NMOS synchronous-rectifier switch. Connect
the inductor from this node to the output filter capacitor and load.
5
SS
Soft-Start. Connect a capacitor from SS to GND to limit inrush current during startup.
6
COMP
Integrator Compensation. Connect a capacitor from COMP to V
CC
for integrator compensation. See
Integrator Amplifier
section.
7
TOFF
Off-Time Select Input. Sets the PMOS power switch off-time during constant-off-time operation. Connect a
resistor from TOFF to GND to adjust the PMOS switch off-time.
8
FB
Feedback Input
—
for both preset-output and adjustable-output operating modes. Connect directly to
output for fixed-voltage operation or to a resistive divider for adjustable operating modes.
9
GND
Analog Ground
10
11
REF
FBSEL
Reference Output. Bypass REF to GND with a 1μF capacitor.
Feedback Select Input. Selects output voltage. See Table 3 for programming instructions.
12
V
CC
Analog Supply Voltage Input. Supplies internal analog circuitry. Bypass V
CC
with a 10
and 2.2μF low-
pass filter. See Figure 1.
13, 15
PGND
Power Ground. Internally connected to the internal NMOS synchronous-rectifier switch.
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25
°
C, unless otherwise noted.)
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